Hi,
we are currently implementing an RTDM driver for our PCI based fieldbus card
running in a MPC5200 system (Xenomai 2.3.5/Kernel 2.4 PPC). In order to provide
backward compatibility for existing applications (using an older Linux version
of the driver) we need an ioctl to let those applications read/write to a
mapped io memory. Therefore we used the following (incomplete) piece of code :
void map_dpm_to_user(pcidev_t *pcidev, rtdm_user_info_t *user_info, void *arg)
{
unsigned long memaddr = 0, memlen = 0;
unsigned char *dpm = NULL;
/* Get start address and length of resource */
memaddr = pci_resource_start(pcidev, 2);
memlen = pci_resource_len(pcidev, 2);
memaddr &= PCI_BASE_ADDRESS_IO_MASK;
/* Request resource */
request_mem_region(memaddr, memlen, NULL);
/* Remap for direct access in kernel space */
dpm = (unsigned char*)ioremap(memaddrmask, memlen);
/* Map to user */
rtdm_iomap_to_user(user_info, memaddr, memlen,
PROT_READ|PROT_WRITE, (void **)arg, NULL, NULL);
}
This code executes without errors but the application freezes on accessing the
mapped memory. There was a similar question posted earlier
(https://mail.gna.org/public/xenomai-core/2007-09/msg00030.html) but the
suggested solution can not be used with a 2.4 kernel because
phys_mem_access_prot was introduced with the kernel version 2.6 (afaik). Can
you confirm this problem? Are there any related patches in the current Xenomai
version (2.4.x)?
Thanks
Thomas
MAN Roland Druckmaschinen AG
Vorsitzender des Aufsichtsrates: Hanno C. Fiedler
Vorstand: Gerd Finkbeiner (Vorsitzender), Dr. Ingo Koch, Dr. Markus Rall, Paul
Steidle
Sitz der Gesellschaft: Offenbach am Main, Registergericht: Amtsgericht
Offenbach HRB-Nr. 42592
USt-Ident-Nr. DE 250200933
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